Structs复习 Action

引入jar包

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

Structs.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <!-- 
    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    

    <include file="example.xml"/>



    <package name="default" namespace="/" extends="struts-default">
        <default-action-ref name="index" />
        <action name="index">
            <result type="redirectAction">
                <param name="actionName">HelloWorld</param>
                <param name="namespace">/example</param>
            </result>
        </action>
    </package>
     -->
    <!-- Add packages here -->
    <constant name="struts.devMode" value="true" />
    <package name="front" extends="struts-default" namespace="/">
        <action name="index" class="com.bjsxt.struts2.front.action.indexAction4">
            <result name="success">/ActionIntroduction.jsp</result>
        </action>
    </package>

</struts>

当输入指定的命名空间和name后他会返回到 action 指定的class里面找到执行excute方法找到她的返回值

根据result的name比较返回值确定返回类型

常用定义的方法有三种主要用第三种因为其已经为我们定义了很多方法

indexAction1

package com.bjsxt.struts2.front.action;

public class IndexAction1 {
    public String execute() {
        return "success";
    }
}

indexAction2

package com.bjsxt.struts2.front.action;

import com.opensymphony.xwork2.Action;

public class IndexAction2 implements Action {
    @Override
    public String execute() {
        return "success";
    }
}

indexAction3

package com.bjsxt.struts2.front.action;

import com.opensymphony.xwork2.ActionSupport;

public class IndexAction3 extends ActionSupport {
    
    @Override
    public String execute() {
        return "success";
    }
}

输入：

http://localhost:6666//Struts2_0300_Action/index